Improvement in quartz-mortars



, A. w. ANDERSON.

Quartz-Mortar.

l No. 165,146. Pafeptedjuly 6,1875.

' `Figi riga Hg 2 W1 messe's 4 Inventor UNITED STATES AUGUST W.ANDERSON, OFLYON COUNTY, NEVADA.

IMPROVEMENT IN QuARTz-MoRTAR's.

Specification forming part of Letters Patent No. l 65, [46, dated July(i, 1875;*app1ication led March 4, 1875.

To all whom t may concern Be it known that I, A. W. ANDERSON, ot' Lyoncounty, State of Nevada, have 'invented an Improvement in the changeablepieces for adapting the height of battery-screens to the wear of thedies in quartz-mills, of which the following is a specification:

The object of my invention is to adapt the height of screens used in themortars of a quartz-battery-to the varying height of the dies occasionedby the wear ot' those dies in crushing, so as to keep the `distancebetween the two as nearly uniform as possible from the time the new dieis put in the mortar until it is worn out.

Figure l of the drawing represents a crosssection of a mortar, such asis ordinarily used in crushing quartz.

D shows where the quartz is inserted into the mortar. B is a die whichreceives the blow of the stamp. O is the screen, usually a reotangularwoodenframe covered on one side by Russia iron punched with ne holes,through which the pulverized quartz is driven when it has attained asufficient neness. A represents one of my changeable pieces. inserted,as shown, so as to receive the bottom of the screen C. This pieceissecured to the mortar by means of the keys E and F. Fig. 2 is a sideview, and Fig. 3 an end view, of one ot' thereabout. At the end of thattime the boss i is worn down about even with the base. With the mortarsin present use ,the screen O cannot be lowered to keep pace with thiswear ot' the die. The consequence of this is, that the pulverized quartzhas to be thrown a higher and still higher distance as the die wearsdown in order to go through the screen. This has the effect of reducingmaterially the Vamount of the crushing.

My intention is to make the piece A of various heights, the highest one,ot' course, being used when the die isnew, aud this after a few days tobe changed to one of less height, and so on until finally the piece A isremoved altogether, and then the screen rests upon the mortar itself atG.

I claiml In aquartz-crushing mortar, the combination of the die or diesB, screen O, and two or more interchangeable supports, A., of varyingheights, substantially as described.

AUGUST WILLIAM' ANDERSON.

Witnesses:

W. G. THOMPSON, JOHN W. PARKER.'

